Interactive Animal and Plant Cells Nucleolus: The prominent structure in the nucleus is the nucleolus. The nucleolus produces ribosomes, which move out of the nucleus and take positions on the rough endoplasmic reticulum where they are critical in protein synthesis. Cytosol: The cytosol is the "soup" within which all the other cell organelles reside and where most of the cellular metabolism occurs. Though mostly water, the cytosol is full of proteins that control cell metabolism including signal transduction pathways, glycolysis, intracellular receptors, and transcription factors. Cytoplasm: This is a collective term for the cytosol plus the organelles suspended within the cytosol. Centrosome: The centrosome, or MICROTUBULE ORGANIZING CENTER (MTOC), is an area in the cell where microtubules are produced. During animal cell division, the centrioles replicate (make new copies) and the centrosome divides. Centriole (animal cells only): Each centriole is a ring of nine groups of fused microtubules.
Serious Games Sciences A Science Odyssey: You Try It: DNA Workshop An embryonic cell divides again and again. Where there was one cell there are two, then four, then eight,... Each holds all the genetic information needed to create a human being. How, exactly, do these cells make copies of themselves? Hair grows from your head, nonstop, day in and day out. The answers to these questions are DNA replication and protein synthesis. Knowledge of the structure of DNA began with the discovery of nucleic acids in 1869. The activity in this section places you within the cell, involving you with the processes of DNA replication and protein synthesis. If you're interested in finding out more about DNA and protein synthesis, check out the other sections. Related People and Discoveries entries
Rana - Monde virtuel dédié aux sciences et technologies sur SCIENCE EN JEU - Accueil Il y a quelques décennies, une étrange colonie de grenouilles, menacée par la pollution, le réchauffement climatique et la destruction des milieux naturels, est partie à la recherche d’un endroit pour échapper à l’extinction qui les menace. Les grenouilles sont sensibles aux modifications de l’environnement. Leur fine peau perméable les rend très vulnérables aux agents polluants. C’est dans le vaste monde de SCIENCE EN JEU qu’elles se sont réfugiées sur l’île de RANA dans l’archipel ENVIRONIUM, où le respect de l’environnement est au coeur des préoccupations de ses habitants. À la course! Es-tu déjà monté à bord d’un véhicule utilisant un biocarburant? Attention! Clique ici pour consulter le palmarès! Évacuation imminente? Une explosion dans l’usine d’habits d’homme-grenouille des Bufos sans scrupules a entraîné la rupture d'un réservoir d’ammoniac de 80 000 litres. Un impressionnant nuage toxique s’échappe maintenant du réservoir. C’est du propre! On a tous du talent.